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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/configfs.h>
3#include <linux/module.h>
4#include <linux/slab.h>
5#include <linux/device.h>
6#include <linux/kstrtox.h>
7#include <linux/nls.h>
8#include <linux/usb/composite.h>
9#include <linux/usb/gadget_configfs.h>
10#include <linux/usb/webusb.h>
11#include "configfs.h"
12#include "u_f.h"
13#include "u_os_desc.h"
14
15int check_user_usb_string(const char *name,
16 struct usb_gadget_strings *stringtab_dev)
17{
18 u16 num;
19 int ret;
20
21 ret = kstrtou16(name, 0, &num);
22 if (ret)
23 return ret;
24
25 if (!usb_validate_langid(num))
26 return -EINVAL;
27
28 stringtab_dev->language = num;
29 return 0;
30}
31
32#define MAX_NAME_LEN 40
33#define MAX_USB_STRING_LANGS 2
34
35static const struct usb_descriptor_header *otg_desc[2];
36
37struct gadget_info {
38 struct config_group group;
39 struct config_group functions_group;
40 struct config_group configs_group;
41 struct config_group strings_group;
42 struct config_group os_desc_group;
43 struct config_group webusb_group;
44
45 struct mutex lock;
46 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
47 struct list_head string_list;
48 struct list_head available_func;
49
50 struct usb_composite_driver composite;
51 struct usb_composite_dev cdev;
52 bool use_os_desc;
53 char b_vendor_code;
54 char qw_sign[OS_STRING_QW_SIGN_LEN];
55 bool use_webusb;
56 u16 bcd_webusb_version;
57 u8 b_webusb_vendor_code;
58 char landing_page[WEBUSB_URL_RAW_MAX_LENGTH];
59
60 spinlock_t spinlock;
61 bool unbind;
62};
63
64static inline struct gadget_info *to_gadget_info(struct config_item *item)
65{
66 return container_of(to_config_group(item), struct gadget_info, group);
67}
68
69struct config_usb_cfg {
70 struct config_group group;
71 struct config_group strings_group;
72 struct list_head string_list;
73 struct usb_configuration c;
74 struct list_head func_list;
75 struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
76};
77
78static inline struct config_usb_cfg *to_config_usb_cfg(struct config_item *item)
79{
80 return container_of(to_config_group(item), struct config_usb_cfg,
81 group);
82}
83
84static inline struct gadget_info *cfg_to_gadget_info(struct config_usb_cfg *cfg)
85{
86 return container_of(cfg->c.cdev, struct gadget_info, cdev);
87}
88
89struct gadget_language {
90 struct usb_gadget_strings stringtab_dev;
91 struct usb_string strings[USB_GADGET_FIRST_AVAIL_IDX];
92 char *manufacturer;
93 char *product;
94 char *serialnumber;
95
96 struct config_group group;
97 struct list_head list;
98 struct list_head gadget_strings;
99 unsigned int nstrings;
100};
101
102struct gadget_config_name {
103 struct usb_gadget_strings stringtab_dev;
104 struct usb_string strings;
105 char *configuration;
106
107 struct config_group group;
108 struct list_head list;
109};
110
111#define USB_MAX_STRING_WITH_NULL_LEN (USB_MAX_STRING_LEN+1)
112
113static int usb_string_copy(const char *s, char **s_copy)
114{
115 int ret;
116 char *str;
117 char *copy = *s_copy;
118 ret = strlen(s);
119 if (ret > USB_MAX_STRING_LEN)
120 return -EOVERFLOW;
121
122 if (copy) {
123 str = copy;
124 } else {
125 str = kmalloc(USB_MAX_STRING_WITH_NULL_LEN, GFP_KERNEL);
126 if (!str)
127 return -ENOMEM;
128 }
129 strcpy(str, s);
130 if (str[ret - 1] == '\n')
131 str[ret - 1] = '\0';
132 *s_copy = str;
133 return 0;
134}
135
136#define GI_DEVICE_DESC_SIMPLE_R_u8(__name) \
137static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
138 char *page) \
139{ \
140 return sprintf(page, "0x%02x\n", \
141 to_gadget_info(item)->cdev.desc.__name); \
142}
143
144#define GI_DEVICE_DESC_SIMPLE_R_u16(__name) \
145static ssize_t gadget_dev_desc_##__name##_show(struct config_item *item, \
146 char *page) \
147{ \
148 return sprintf(page, "0x%04x\n", \
149 le16_to_cpup(&to_gadget_info(item)->cdev.desc.__name)); \
150}
151
152
153#define GI_DEVICE_DESC_SIMPLE_W_u8(_name) \
154static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
155 const char *page, size_t len) \
156{ \
157 u8 val; \
158 int ret; \
159 ret = kstrtou8(page, 0, &val); \
160 if (ret) \
161 return ret; \
162 to_gadget_info(item)->cdev.desc._name = val; \
163 return len; \
164}
165
166#define GI_DEVICE_DESC_SIMPLE_W_u16(_name) \
167static ssize_t gadget_dev_desc_##_name##_store(struct config_item *item, \
168 const char *page, size_t len) \
169{ \
170 u16 val; \
171 int ret; \
172 ret = kstrtou16(page, 0, &val); \
173 if (ret) \
174 return ret; \
175 to_gadget_info(item)->cdev.desc._name = cpu_to_le16p(&val); \
176 return len; \
177}
178
179#define GI_DEVICE_DESC_SIMPLE_RW(_name, _type) \
180 GI_DEVICE_DESC_SIMPLE_R_##_type(_name) \
181 GI_DEVICE_DESC_SIMPLE_W_##_type(_name)
182
183GI_DEVICE_DESC_SIMPLE_R_u16(bcdUSB);
184GI_DEVICE_DESC_SIMPLE_RW(bDeviceClass, u8);
185GI_DEVICE_DESC_SIMPLE_RW(bDeviceSubClass, u8);
186GI_DEVICE_DESC_SIMPLE_RW(bDeviceProtocol, u8);
187GI_DEVICE_DESC_SIMPLE_RW(bMaxPacketSize0, u8);
188GI_DEVICE_DESC_SIMPLE_RW(idVendor, u16);
189GI_DEVICE_DESC_SIMPLE_RW(idProduct, u16);
190GI_DEVICE_DESC_SIMPLE_R_u16(bcdDevice);
191
192static ssize_t is_valid_bcd(u16 bcd_val)
193{
194 if ((bcd_val & 0xf) > 9)
195 return -EINVAL;
196 if (((bcd_val >> 4) & 0xf) > 9)
197 return -EINVAL;
198 if (((bcd_val >> 8) & 0xf) > 9)
199 return -EINVAL;
200 if (((bcd_val >> 12) & 0xf) > 9)
201 return -EINVAL;
202 return 0;
203}
204
205static ssize_t gadget_dev_desc_bcdDevice_store(struct config_item *item,
206 const char *page, size_t len)
207{
208 u16 bcdDevice;
209 int ret;
210
211 ret = kstrtou16(page, 0, &bcdDevice);
212 if (ret)
213 return ret;
214 ret = is_valid_bcd(bcdDevice);
215 if (ret)
216 return ret;
217
218 to_gadget_info(item)->cdev.desc.bcdDevice = cpu_to_le16(bcdDevice);
219 return len;
220}
221
222static ssize_t gadget_dev_desc_bcdUSB_store(struct config_item *item,
223 const char *page, size_t len)
224{
225 u16 bcdUSB;
226 int ret;
227
228 ret = kstrtou16(page, 0, &bcdUSB);
229 if (ret)
230 return ret;
231 ret = is_valid_bcd(bcdUSB);
232 if (ret)
233 return ret;
234
235 to_gadget_info(item)->cdev.desc.bcdUSB = cpu_to_le16(bcdUSB);
236 return len;
237}
238
239static ssize_t gadget_dev_desc_UDC_show(struct config_item *item, char *page)
240{
241 struct gadget_info *gi = to_gadget_info(item);
242 char *udc_name;
243 int ret;
244
245 mutex_lock(&gi->lock);
246 udc_name = gi->composite.gadget_driver.udc_name;
247 ret = sprintf(page, "%s\n", udc_name ?: "");
248 mutex_unlock(&gi->lock);
249
250 return ret;
251}
252
253static int unregister_gadget(struct gadget_info *gi)
254{
255 int ret;
256
257 if (!gi->composite.gadget_driver.udc_name)
258 return -ENODEV;
259
260 ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
261 if (ret)
262 return ret;
263 kfree(gi->composite.gadget_driver.udc_name);
264 gi->composite.gadget_driver.udc_name = NULL;
265 return 0;
266}
267
268static ssize_t gadget_dev_desc_UDC_store(struct config_item *item,
269 const char *page, size_t len)
270{
271 struct gadget_info *gi = to_gadget_info(item);
272 char *name;
273 int ret;
274
275 if (strlen(page) < len)
276 return -EOVERFLOW;
277
278 name = kstrdup(page, GFP_KERNEL);
279 if (!name)
280 return -ENOMEM;
281 if (name[len - 1] == '\n')
282 name[len - 1] = '\0';
283
284 mutex_lock(&gi->lock);
285
286 if (!strlen(name)) {
287 ret = unregister_gadget(gi);
288 if (ret)
289 goto err;
290 kfree(name);
291 } else {
292 if (gi->composite.gadget_driver.udc_name) {
293 ret = -EBUSY;
294 goto err;
295 }
296 gi->composite.gadget_driver.udc_name = name;
297 ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
298 if (ret) {
299 gi->composite.gadget_driver.udc_name = NULL;
300 goto err;
301 }
302 }
303 mutex_unlock(&gi->lock);
304 return len;
305err:
306 kfree(name);
307 mutex_unlock(&gi->lock);
308 return ret;
309}
310
311static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
312 char *page)
313{
314 enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
315
316 return sprintf(page, "%s\n", usb_speed_string(speed));
317}
318
319static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
320 const char *page, size_t len)
321{
322 struct gadget_info *gi = to_gadget_info(item);
323
324 mutex_lock(&gi->lock);
325
326 /* Prevent changing of max_speed after the driver is binded */
327 if (gi->composite.gadget_driver.udc_name)
328 goto err;
329
330 if (strncmp(page, "super-speed-plus", 16) == 0)
331 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
332 else if (strncmp(page, "super-speed", 11) == 0)
333 gi->composite.max_speed = USB_SPEED_SUPER;
334 else if (strncmp(page, "high-speed", 10) == 0)
335 gi->composite.max_speed = USB_SPEED_HIGH;
336 else if (strncmp(page, "full-speed", 10) == 0)
337 gi->composite.max_speed = USB_SPEED_FULL;
338 else if (strncmp(page, "low-speed", 9) == 0)
339 gi->composite.max_speed = USB_SPEED_LOW;
340 else
341 goto err;
342
343 gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
344
345 mutex_unlock(&gi->lock);
346 return len;
347err:
348 mutex_unlock(&gi->lock);
349 return -EINVAL;
350}
351
352CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
353CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
354CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
355CONFIGFS_ATTR(gadget_dev_desc_, bMaxPacketSize0);
356CONFIGFS_ATTR(gadget_dev_desc_, idVendor);
357CONFIGFS_ATTR(gadget_dev_desc_, idProduct);
358CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
359CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
360CONFIGFS_ATTR(gadget_dev_desc_, UDC);
361CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
362
363static struct configfs_attribute *gadget_root_attrs[] = {
364 &gadget_dev_desc_attr_bDeviceClass,
365 &gadget_dev_desc_attr_bDeviceSubClass,
366 &gadget_dev_desc_attr_bDeviceProtocol,
367 &gadget_dev_desc_attr_bMaxPacketSize0,
368 &gadget_dev_desc_attr_idVendor,
369 &gadget_dev_desc_attr_idProduct,
370 &gadget_dev_desc_attr_bcdDevice,
371 &gadget_dev_desc_attr_bcdUSB,
372 &gadget_dev_desc_attr_UDC,
373 &gadget_dev_desc_attr_max_speed,
374 NULL,
375};
376
377static inline struct gadget_language *to_gadget_language(struct config_item *item)
378{
379 return container_of(to_config_group(item), struct gadget_language,
380 group);
381}
382
383static inline struct gadget_config_name *to_gadget_config_name(
384 struct config_item *item)
385{
386 return container_of(to_config_group(item), struct gadget_config_name,
387 group);
388}
389
390static inline struct usb_function_instance *to_usb_function_instance(
391 struct config_item *item)
392{
393 return container_of(to_config_group(item),
394 struct usb_function_instance, group);
395}
396
397static void gadget_info_attr_release(struct config_item *item)
398{
399 struct gadget_info *gi = to_gadget_info(item);
400
401 WARN_ON(!list_empty(&gi->cdev.configs));
402 WARN_ON(!list_empty(&gi->string_list));
403 WARN_ON(!list_empty(&gi->available_func));
404 kfree(gi->composite.gadget_driver.function);
405 kfree(gi->composite.gadget_driver.driver.name);
406 kfree(gi);
407}
408
409static struct configfs_item_operations gadget_root_item_ops = {
410 .release = gadget_info_attr_release,
411};
412
413static void gadget_config_attr_release(struct config_item *item)
414{
415 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
416
417 WARN_ON(!list_empty(&cfg->c.functions));
418 list_del(&cfg->c.list);
419 kfree(cfg->c.label);
420 kfree(cfg);
421}
422
423static int config_usb_cfg_link(
424 struct config_item *usb_cfg_ci,
425 struct config_item *usb_func_ci)
426{
427 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
428 struct gadget_info *gi = cfg_to_gadget_info(cfg);
429
430 struct usb_function_instance *fi =
431 to_usb_function_instance(usb_func_ci);
432 struct usb_function_instance *a_fi = NULL, *iter;
433 struct usb_function *f;
434 int ret;
435
436 mutex_lock(&gi->lock);
437 /*
438 * Make sure this function is from within our _this_ gadget and not
439 * from another gadget or a random directory.
440 * Also a function instance can only be linked once.
441 */
442
443 if (gi->composite.gadget_driver.udc_name) {
444 ret = -EINVAL;
445 goto out;
446 }
447
448 list_for_each_entry(iter, &gi->available_func, cfs_list) {
449 if (iter != fi)
450 continue;
451 a_fi = iter;
452 break;
453 }
454 if (!a_fi) {
455 ret = -EINVAL;
456 goto out;
457 }
458
459 list_for_each_entry(f, &cfg->func_list, list) {
460 if (f->fi == fi) {
461 ret = -EEXIST;
462 goto out;
463 }
464 }
465
466 f = usb_get_function(fi);
467 if (IS_ERR(f)) {
468 ret = PTR_ERR(f);
469 goto out;
470 }
471
472 /* stash the function until we bind it to the gadget */
473 list_add_tail(&f->list, &cfg->func_list);
474 ret = 0;
475out:
476 mutex_unlock(&gi->lock);
477 return ret;
478}
479
480static void config_usb_cfg_unlink(
481 struct config_item *usb_cfg_ci,
482 struct config_item *usb_func_ci)
483{
484 struct config_usb_cfg *cfg = to_config_usb_cfg(usb_cfg_ci);
485 struct gadget_info *gi = cfg_to_gadget_info(cfg);
486
487 struct usb_function_instance *fi =
488 to_usb_function_instance(usb_func_ci);
489 struct usb_function *f;
490
491 /*
492 * ideally I would like to forbid to unlink functions while a gadget is
493 * bound to an UDC. Since this isn't possible at the moment, we simply
494 * force an unbind, the function is available here and then we can
495 * remove the function.
496 */
497 mutex_lock(&gi->lock);
498 if (gi->composite.gadget_driver.udc_name)
499 unregister_gadget(gi);
500 WARN_ON(gi->composite.gadget_driver.udc_name);
501
502 list_for_each_entry(f, &cfg->func_list, list) {
503 if (f->fi == fi) {
504 list_del(&f->list);
505 usb_put_function(f);
506 mutex_unlock(&gi->lock);
507 return;
508 }
509 }
510 mutex_unlock(&gi->lock);
511 WARN(1, "Unable to locate function to unbind\n");
512}
513
514static struct configfs_item_operations gadget_config_item_ops = {
515 .release = gadget_config_attr_release,
516 .allow_link = config_usb_cfg_link,
517 .drop_link = config_usb_cfg_unlink,
518};
519
520
521static ssize_t gadget_config_desc_MaxPower_show(struct config_item *item,
522 char *page)
523{
524 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
525
526 return sprintf(page, "%u\n", cfg->c.MaxPower);
527}
528
529static ssize_t gadget_config_desc_MaxPower_store(struct config_item *item,
530 const char *page, size_t len)
531{
532 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
533 u16 val;
534 int ret;
535 ret = kstrtou16(page, 0, &val);
536 if (ret)
537 return ret;
538 if (DIV_ROUND_UP(val, 8) > 0xff)
539 return -ERANGE;
540 cfg->c.MaxPower = val;
541 return len;
542}
543
544static ssize_t gadget_config_desc_bmAttributes_show(struct config_item *item,
545 char *page)
546{
547 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
548
549 return sprintf(page, "0x%02x\n", cfg->c.bmAttributes);
550}
551
552static ssize_t gadget_config_desc_bmAttributes_store(struct config_item *item,
553 const char *page, size_t len)
554{
555 struct config_usb_cfg *cfg = to_config_usb_cfg(item);
556 u8 val;
557 int ret;
558 ret = kstrtou8(page, 0, &val);
559 if (ret)
560 return ret;
561 if (!(val & USB_CONFIG_ATT_ONE))
562 return -EINVAL;
563 if (val & ~(USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER |
564 USB_CONFIG_ATT_WAKEUP))
565 return -EINVAL;
566 cfg->c.bmAttributes = val;
567 return len;
568}
569
570CONFIGFS_ATTR(gadget_config_desc_, MaxPower);
571CONFIGFS_ATTR(gadget_config_desc_, bmAttributes);
572
573static struct configfs_attribute *gadget_config_attrs[] = {
574 &gadget_config_desc_attr_MaxPower,
575 &gadget_config_desc_attr_bmAttributes,
576 NULL,
577};
578
579static const struct config_item_type gadget_config_type = {
580 .ct_item_ops = &gadget_config_item_ops,
581 .ct_attrs = gadget_config_attrs,
582 .ct_owner = THIS_MODULE,
583};
584
585static const struct config_item_type gadget_root_type = {
586 .ct_item_ops = &gadget_root_item_ops,
587 .ct_attrs = gadget_root_attrs,
588 .ct_owner = THIS_MODULE,
589};
590
591static void composite_init_dev(struct usb_composite_dev *cdev)
592{
593 spin_lock_init(&cdev->lock);
594 INIT_LIST_HEAD(&cdev->configs);
595 INIT_LIST_HEAD(&cdev->gstrings);
596}
597
598static struct config_group *function_make(
599 struct config_group *group,
600 const char *name)
601{
602 struct gadget_info *gi;
603 struct usb_function_instance *fi;
604 char buf[MAX_NAME_LEN];
605 char *func_name;
606 char *instance_name;
607 int ret;
608
609 if (strlen(name) >= MAX_NAME_LEN)
610 return ERR_PTR(-ENAMETOOLONG);
611
612 scnprintf(buf, MAX_NAME_LEN, "%s", name);
613
614 func_name = buf;
615 instance_name = strchr(func_name, '.');
616 if (!instance_name) {
617 pr_err("Unable to locate . in FUNC.INSTANCE\n");
618 return ERR_PTR(-EINVAL);
619 }
620 *instance_name = '\0';
621 instance_name++;
622
623 fi = usb_get_function_instance(func_name);
624 if (IS_ERR(fi))
625 return ERR_CAST(fi);
626
627 ret = config_item_set_name(&fi->group.cg_item, "%s", name);
628 if (ret) {
629 usb_put_function_instance(fi);
630 return ERR_PTR(ret);
631 }
632 if (fi->set_inst_name) {
633 ret = fi->set_inst_name(fi, instance_name);
634 if (ret) {
635 usb_put_function_instance(fi);
636 return ERR_PTR(ret);
637 }
638 }
639
640 gi = container_of(group, struct gadget_info, functions_group);
641
642 mutex_lock(&gi->lock);
643 list_add_tail(&fi->cfs_list, &gi->available_func);
644 mutex_unlock(&gi->lock);
645 return &fi->group;
646}
647
648static void function_drop(
649 struct config_group *group,
650 struct config_item *item)
651{
652 struct usb_function_instance *fi = to_usb_function_instance(item);
653 struct gadget_info *gi;
654
655 gi = container_of(group, struct gadget_info, functions_group);
656
657 mutex_lock(&gi->lock);
658 list_del(&fi->cfs_list);
659 mutex_unlock(&gi->lock);
660 config_item_put(item);
661}
662
663static struct configfs_group_operations functions_ops = {
664 .make_group = &function_make,
665 .drop_item = &function_drop,
666};
667
668static const struct config_item_type functions_type = {
669 .ct_group_ops = &functions_ops,
670 .ct_owner = THIS_MODULE,
671};
672
673GS_STRINGS_RW(gadget_config_name, configuration);
674
675static struct configfs_attribute *gadget_config_name_langid_attrs[] = {
676 &gadget_config_name_attr_configuration,
677 NULL,
678};
679
680static void gadget_config_name_attr_release(struct config_item *item)
681{
682 struct gadget_config_name *cn = to_gadget_config_name(item);
683
684 kfree(cn->configuration);
685
686 list_del(&cn->list);
687 kfree(cn);
688}
689
690USB_CONFIG_STRING_RW_OPS(gadget_config_name);
691USB_CONFIG_STRINGS_LANG(gadget_config_name, config_usb_cfg);
692
693static struct config_group *config_desc_make(
694 struct config_group *group,
695 const char *name)
696{
697 struct gadget_info *gi;
698 struct config_usb_cfg *cfg;
699 char buf[MAX_NAME_LEN];
700 char *num_str;
701 u8 num;
702 int ret;
703
704 gi = container_of(group, struct gadget_info, configs_group);
705
706 if (strlen(name) >= MAX_NAME_LEN)
707 return ERR_PTR(-ENAMETOOLONG);
708
709 scnprintf(buf, MAX_NAME_LEN, "%s", name);
710
711 num_str = strchr(buf, '.');
712 if (!num_str) {
713 pr_err("Unable to locate . in name.bConfigurationValue\n");
714 return ERR_PTR(-EINVAL);
715 }
716
717 *num_str = '\0';
718 num_str++;
719
720 if (!strlen(buf))
721 return ERR_PTR(-EINVAL);
722
723 ret = kstrtou8(num_str, 0, &num);
724 if (ret)
725 return ERR_PTR(ret);
726
727 cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
728 if (!cfg)
729 return ERR_PTR(-ENOMEM);
730 cfg->c.label = kstrdup(buf, GFP_KERNEL);
731 if (!cfg->c.label) {
732 ret = -ENOMEM;
733 goto err;
734 }
735 cfg->c.bConfigurationValue = num;
736 cfg->c.MaxPower = CONFIG_USB_GADGET_VBUS_DRAW;
737 cfg->c.bmAttributes = USB_CONFIG_ATT_ONE;
738 INIT_LIST_HEAD(&cfg->string_list);
739 INIT_LIST_HEAD(&cfg->func_list);
740
741 config_group_init_type_name(&cfg->group, name,
742 &gadget_config_type);
743
744 config_group_init_type_name(&cfg->strings_group, "strings",
745 &gadget_config_name_strings_type);
746 configfs_add_default_group(&cfg->strings_group, &cfg->group);
747
748 ret = usb_add_config_only(&gi->cdev, &cfg->c);
749 if (ret)
750 goto err;
751
752 return &cfg->group;
753err:
754 kfree(cfg->c.label);
755 kfree(cfg);
756 return ERR_PTR(ret);
757}
758
759static void config_desc_drop(
760 struct config_group *group,
761 struct config_item *item)
762{
763 config_item_put(item);
764}
765
766static struct configfs_group_operations config_desc_ops = {
767 .make_group = &config_desc_make,
768 .drop_item = &config_desc_drop,
769};
770
771static const struct config_item_type config_desc_type = {
772 .ct_group_ops = &config_desc_ops,
773 .ct_owner = THIS_MODULE,
774};
775
776GS_STRINGS_RW(gadget_language, manufacturer);
777GS_STRINGS_RW(gadget_language, product);
778GS_STRINGS_RW(gadget_language, serialnumber);
779
780static struct configfs_attribute *gadget_language_langid_attrs[] = {
781 &gadget_language_attr_manufacturer,
782 &gadget_language_attr_product,
783 &gadget_language_attr_serialnumber,
784 NULL,
785};
786
787static void gadget_language_attr_release(struct config_item *item)
788{
789 struct gadget_language *gs = to_gadget_language(item);
790
791 kfree(gs->manufacturer);
792 kfree(gs->product);
793 kfree(gs->serialnumber);
794
795 list_del(&gs->list);
796 kfree(gs);
797}
798
799static struct configfs_item_operations gadget_language_langid_item_ops = {
800 .release = gadget_language_attr_release,
801};
802
803static ssize_t gadget_string_id_show(struct config_item *item, char *page)
804{
805 struct gadget_string *string = to_gadget_string(item);
806 int ret;
807
808 ret = sprintf(page, "%u\n", string->usb_string.id);
809 return ret;
810}
811CONFIGFS_ATTR_RO(gadget_string_, id);
812
813static ssize_t gadget_string_s_show(struct config_item *item, char *page)
814{
815 struct gadget_string *string = to_gadget_string(item);
816 int ret;
817
818 ret = sysfs_emit(page, "%s\n", string->string);
819 return ret;
820}
821
822static ssize_t gadget_string_s_store(struct config_item *item, const char *page,
823 size_t len)
824{
825 struct gadget_string *string = to_gadget_string(item);
826 int size = min(sizeof(string->string), len + 1);
827
828 if (len > USB_MAX_STRING_LEN)
829 return -EINVAL;
830
831 return strscpy(string->string, page, size);
832}
833CONFIGFS_ATTR(gadget_string_, s);
834
835static struct configfs_attribute *gadget_string_attrs[] = {
836 &gadget_string_attr_id,
837 &gadget_string_attr_s,
838 NULL,
839};
840
841static void gadget_string_release(struct config_item *item)
842{
843 struct gadget_string *string = to_gadget_string(item);
844
845 kfree(string);
846}
847
848static struct configfs_item_operations gadget_string_item_ops = {
849 .release = gadget_string_release,
850};
851
852static const struct config_item_type gadget_string_type = {
853 .ct_item_ops = &gadget_string_item_ops,
854 .ct_attrs = gadget_string_attrs,
855 .ct_owner = THIS_MODULE,
856};
857
858static struct config_item *gadget_language_string_make(struct config_group *group,
859 const char *name)
860{
861 struct gadget_language *language;
862 struct gadget_string *string;
863
864 language = to_gadget_language(&group->cg_item);
865
866 string = kzalloc(sizeof(*string), GFP_KERNEL);
867 if (!string)
868 return ERR_PTR(-ENOMEM);
869
870 string->usb_string.id = language->nstrings++;
871 string->usb_string.s = string->string;
872 list_add_tail(&string->list, &language->gadget_strings);
873
874 config_item_init_type_name(&string->item, name, &gadget_string_type);
875
876 return &string->item;
877}
878
879static void gadget_language_string_drop(struct config_group *group,
880 struct config_item *item)
881{
882 struct gadget_language *language;
883 struct gadget_string *string;
884 unsigned int i = USB_GADGET_FIRST_AVAIL_IDX;
885
886 language = to_gadget_language(&group->cg_item);
887 string = to_gadget_string(item);
888
889 list_del(&string->list);
890 language->nstrings--;
891
892 /* Reset the ids for the language's strings to guarantee a continuous set */
893 list_for_each_entry(string, &language->gadget_strings, list)
894 string->usb_string.id = i++;
895}
896
897static struct configfs_group_operations gadget_language_langid_group_ops = {
898 .make_item = gadget_language_string_make,
899 .drop_item = gadget_language_string_drop,
900};
901
902static struct config_item_type gadget_language_type = {
903 .ct_item_ops = &gadget_language_langid_item_ops,
904 .ct_group_ops = &gadget_language_langid_group_ops,
905 .ct_attrs = gadget_language_langid_attrs,
906 .ct_owner = THIS_MODULE,
907};
908
909static struct config_group *gadget_language_make(struct config_group *group,
910 const char *name)
911{
912 struct gadget_info *gi;
913 struct gadget_language *gs;
914 struct gadget_language *new;
915 int langs = 0;
916 int ret;
917
918 new = kzalloc(sizeof(*new), GFP_KERNEL);
919 if (!new)
920 return ERR_PTR(-ENOMEM);
921
922 ret = check_user_usb_string(name, &new->stringtab_dev);
923 if (ret)
924 goto err;
925 config_group_init_type_name(&new->group, name,
926 &gadget_language_type);
927
928 gi = container_of(group, struct gadget_info, strings_group);
929 ret = -EEXIST;
930 list_for_each_entry(gs, &gi->string_list, list) {
931 if (gs->stringtab_dev.language == new->stringtab_dev.language)
932 goto err;
933 langs++;
934 }
935 ret = -EOVERFLOW;
936 if (langs >= MAX_USB_STRING_LANGS)
937 goto err;
938
939 list_add_tail(&new->list, &gi->string_list);
940 INIT_LIST_HEAD(&new->gadget_strings);
941
942 /* We have the default manufacturer, product and serialnumber strings */
943 new->nstrings = 3;
944 return &new->group;
945err:
946 kfree(new);
947 return ERR_PTR(ret);
948}
949
950static void gadget_language_drop(struct config_group *group,
951 struct config_item *item)
952{
953 config_item_put(item);
954}
955
956static struct configfs_group_operations gadget_language_group_ops = {
957 .make_group = &gadget_language_make,
958 .drop_item = &gadget_language_drop,
959};
960
961static struct config_item_type gadget_language_strings_type = {
962 .ct_group_ops = &gadget_language_group_ops,
963 .ct_owner = THIS_MODULE,
964};
965
966static inline struct gadget_info *webusb_item_to_gadget_info(
967 struct config_item *item)
968{
969 return container_of(to_config_group(item),
970 struct gadget_info, webusb_group);
971}
972
973static ssize_t webusb_use_show(struct config_item *item, char *page)
974{
975 return sysfs_emit(page, "%d\n",
976 webusb_item_to_gadget_info(item)->use_webusb);
977}
978
979static ssize_t webusb_use_store(struct config_item *item, const char *page,
980 size_t len)
981{
982 struct gadget_info *gi = webusb_item_to_gadget_info(item);
983 int ret;
984 bool use;
985
986 ret = kstrtobool(page, &use);
987 if (ret)
988 return ret;
989
990 mutex_lock(&gi->lock);
991 gi->use_webusb = use;
992 mutex_unlock(&gi->lock);
993
994 return len;
995}
996
997static ssize_t webusb_bcdVersion_show(struct config_item *item, char *page)
998{
999 return sysfs_emit(page, "0x%04x\n",
1000 webusb_item_to_gadget_info(item)->bcd_webusb_version);
1001}
1002
1003static ssize_t webusb_bcdVersion_store(struct config_item *item,
1004 const char *page, size_t len)
1005{
1006 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1007 u16 bcdVersion;
1008 int ret;
1009
1010 ret = kstrtou16(page, 0, &bcdVersion);
1011 if (ret)
1012 return ret;
1013
1014 ret = is_valid_bcd(bcdVersion);
1015 if (ret)
1016 return ret;
1017
1018 mutex_lock(&gi->lock);
1019 gi->bcd_webusb_version = bcdVersion;
1020 mutex_unlock(&gi->lock);
1021
1022 return len;
1023}
1024
1025static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page)
1026{
1027 return sysfs_emit(page, "0x%02x\n",
1028 webusb_item_to_gadget_info(item)->b_webusb_vendor_code);
1029}
1030
1031static ssize_t webusb_bVendorCode_store(struct config_item *item,
1032 const char *page, size_t len)
1033{
1034 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1035 int ret;
1036 u8 b_vendor_code;
1037
1038 ret = kstrtou8(page, 0, &b_vendor_code);
1039 if (ret)
1040 return ret;
1041
1042 mutex_lock(&gi->lock);
1043 gi->b_webusb_vendor_code = b_vendor_code;
1044 mutex_unlock(&gi->lock);
1045
1046 return len;
1047}
1048
1049static ssize_t webusb_landingPage_show(struct config_item *item, char *page)
1050{
1051 return sysfs_emit(page, "%s\n", webusb_item_to_gadget_info(item)->landing_page);
1052}
1053
1054static ssize_t webusb_landingPage_store(struct config_item *item, const char *page,
1055 size_t len)
1056{
1057 struct gadget_info *gi = webusb_item_to_gadget_info(item);
1058 unsigned int bytes_to_strip = 0;
1059 int l = len;
1060
1061 if (page[l - 1] == '\n') {
1062 --l;
1063 ++bytes_to_strip;
1064 }
1065
1066 if (l > sizeof(gi->landing_page)) {
1067 pr_err("webusb: landingPage URL too long\n");
1068 return -EINVAL;
1069 }
1070
1071 // validation
1072 if (strncasecmp(page, "https://", 8) == 0)
1073 bytes_to_strip = 8;
1074 else if (strncasecmp(page, "http://", 7) == 0)
1075 bytes_to_strip = 7;
1076 else
1077 bytes_to_strip = 0;
1078
1079 if (l > U8_MAX - WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH + bytes_to_strip) {
1080 pr_err("webusb: landingPage URL %d bytes too long for given URL scheme\n",
1081 l - U8_MAX + WEBUSB_URL_DESCRIPTOR_HEADER_LENGTH - bytes_to_strip);
1082 return -EINVAL;
1083 }
1084
1085 mutex_lock(&gi->lock);
1086 // ensure 0 bytes are set, in case the new landing page is shorter then the old one.
1087 memcpy_and_pad(gi->landing_page, sizeof(gi->landing_page), page, l, 0);
1088 mutex_unlock(&gi->lock);
1089
1090 return len;
1091}
1092
1093CONFIGFS_ATTR(webusb_, use);
1094CONFIGFS_ATTR(webusb_, bVendorCode);
1095CONFIGFS_ATTR(webusb_, bcdVersion);
1096CONFIGFS_ATTR(webusb_, landingPage);
1097
1098static struct configfs_attribute *webusb_attrs[] = {
1099 &webusb_attr_use,
1100 &webusb_attr_bcdVersion,
1101 &webusb_attr_bVendorCode,
1102 &webusb_attr_landingPage,
1103 NULL,
1104};
1105
1106static struct config_item_type webusb_type = {
1107 .ct_attrs = webusb_attrs,
1108 .ct_owner = THIS_MODULE,
1109};
1110
1111static inline struct gadget_info *os_desc_item_to_gadget_info(
1112 struct config_item *item)
1113{
1114 return container_of(to_config_group(item),
1115 struct gadget_info, os_desc_group);
1116}
1117
1118static ssize_t os_desc_use_show(struct config_item *item, char *page)
1119{
1120 return sprintf(page, "%d\n",
1121 os_desc_item_to_gadget_info(item)->use_os_desc);
1122}
1123
1124static ssize_t os_desc_use_store(struct config_item *item, const char *page,
1125 size_t len)
1126{
1127 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1128 int ret;
1129 bool use;
1130
1131 ret = kstrtobool(page, &use);
1132 if (ret)
1133 return ret;
1134
1135 mutex_lock(&gi->lock);
1136 gi->use_os_desc = use;
1137 mutex_unlock(&gi->lock);
1138
1139 return len;
1140}
1141
1142static ssize_t os_desc_b_vendor_code_show(struct config_item *item, char *page)
1143{
1144 return sprintf(page, "0x%02x\n",
1145 os_desc_item_to_gadget_info(item)->b_vendor_code);
1146}
1147
1148static ssize_t os_desc_b_vendor_code_store(struct config_item *item,
1149 const char *page, size_t len)
1150{
1151 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1152 int ret;
1153 u8 b_vendor_code;
1154
1155 ret = kstrtou8(page, 0, &b_vendor_code);
1156 if (ret)
1157 return ret;
1158
1159 mutex_lock(&gi->lock);
1160 gi->b_vendor_code = b_vendor_code;
1161 mutex_unlock(&gi->lock);
1162
1163 return len;
1164}
1165
1166static ssize_t os_desc_qw_sign_show(struct config_item *item, char *page)
1167{
1168 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1169 int res;
1170
1171 res = utf16s_to_utf8s((wchar_t *) gi->qw_sign, OS_STRING_QW_SIGN_LEN,
1172 UTF16_LITTLE_ENDIAN, page, PAGE_SIZE - 1);
1173 page[res++] = '\n';
1174
1175 return res;
1176}
1177
1178static ssize_t os_desc_qw_sign_store(struct config_item *item, const char *page,
1179 size_t len)
1180{
1181 struct gadget_info *gi = os_desc_item_to_gadget_info(item);
1182 int res, l;
1183
1184 l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
1185 if (page[l - 1] == '\n')
1186 --l;
1187
1188 mutex_lock(&gi->lock);
1189 res = utf8s_to_utf16s(page, l,
1190 UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
1191 OS_STRING_QW_SIGN_LEN);
1192 if (res > 0)
1193 res = len;
1194 mutex_unlock(&gi->lock);
1195
1196 return res;
1197}
1198
1199CONFIGFS_ATTR(os_desc_, use);
1200CONFIGFS_ATTR(os_desc_, b_vendor_code);
1201CONFIGFS_ATTR(os_desc_, qw_sign);
1202
1203static struct configfs_attribute *os_desc_attrs[] = {
1204 &os_desc_attr_use,
1205 &os_desc_attr_b_vendor_code,
1206 &os_desc_attr_qw_sign,
1207 NULL,
1208};
1209
1210static int os_desc_link(struct config_item *os_desc_ci,
1211 struct config_item *usb_cfg_ci)
1212{
1213 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
1214 struct usb_composite_dev *cdev = &gi->cdev;
1215 struct config_usb_cfg *c_target = to_config_usb_cfg(usb_cfg_ci);
1216 struct usb_configuration *c = NULL, *iter;
1217 int ret;
1218
1219 mutex_lock(&gi->lock);
1220 list_for_each_entry(iter, &cdev->configs, list) {
1221 if (iter != &c_target->c)
1222 continue;
1223 c = iter;
1224 break;
1225 }
1226 if (!c) {
1227 ret = -EINVAL;
1228 goto out;
1229 }
1230
1231 if (cdev->os_desc_config) {
1232 ret = -EBUSY;
1233 goto out;
1234 }
1235
1236 cdev->os_desc_config = &c_target->c;
1237 ret = 0;
1238
1239out:
1240 mutex_unlock(&gi->lock);
1241 return ret;
1242}
1243
1244static void os_desc_unlink(struct config_item *os_desc_ci,
1245 struct config_item *usb_cfg_ci)
1246{
1247 struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
1248 struct usb_composite_dev *cdev = &gi->cdev;
1249
1250 mutex_lock(&gi->lock);
1251 if (gi->composite.gadget_driver.udc_name)
1252 unregister_gadget(gi);
1253 cdev->os_desc_config = NULL;
1254 WARN_ON(gi->composite.gadget_driver.udc_name);
1255 mutex_unlock(&gi->lock);
1256}
1257
1258static struct configfs_item_operations os_desc_ops = {
1259 .allow_link = os_desc_link,
1260 .drop_link = os_desc_unlink,
1261};
1262
1263static struct config_item_type os_desc_type = {
1264 .ct_item_ops = &os_desc_ops,
1265 .ct_attrs = os_desc_attrs,
1266 .ct_owner = THIS_MODULE,
1267};
1268
1269static inline struct usb_os_desc_ext_prop
1270*to_usb_os_desc_ext_prop(struct config_item *item)
1271{
1272 return container_of(item, struct usb_os_desc_ext_prop, item);
1273}
1274
1275static ssize_t ext_prop_type_show(struct config_item *item, char *page)
1276{
1277 return sprintf(page, "%d\n", to_usb_os_desc_ext_prop(item)->type);
1278}
1279
1280static ssize_t ext_prop_type_store(struct config_item *item,
1281 const char *page, size_t len)
1282{
1283 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1284 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1285 u8 type;
1286 int ret;
1287
1288 ret = kstrtou8(page, 0, &type);
1289 if (ret)
1290 return ret;
1291
1292 if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI)
1293 return -EINVAL;
1294
1295 if (desc->opts_mutex)
1296 mutex_lock(desc->opts_mutex);
1297
1298 if ((ext_prop->type == USB_EXT_PROP_BINARY ||
1299 ext_prop->type == USB_EXT_PROP_LE32 ||
1300 ext_prop->type == USB_EXT_PROP_BE32) &&
1301 (type == USB_EXT_PROP_UNICODE ||
1302 type == USB_EXT_PROP_UNICODE_ENV ||
1303 type == USB_EXT_PROP_UNICODE_LINK))
1304 ext_prop->data_len <<= 1;
1305 else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
1306 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1307 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
1308 (type == USB_EXT_PROP_BINARY ||
1309 type == USB_EXT_PROP_LE32 ||
1310 type == USB_EXT_PROP_BE32))
1311 ext_prop->data_len >>= 1;
1312 ext_prop->type = type;
1313
1314 if (desc->opts_mutex)
1315 mutex_unlock(desc->opts_mutex);
1316 return len;
1317}
1318
1319static ssize_t ext_prop_data_show(struct config_item *item, char *page)
1320{
1321 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1322 int len = ext_prop->data_len;
1323
1324 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1325 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1326 ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
1327 len >>= 1;
1328 memcpy(page, ext_prop->data, len);
1329
1330 return len;
1331}
1332
1333static ssize_t ext_prop_data_store(struct config_item *item,
1334 const char *page, size_t len)
1335{
1336 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1337 struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
1338 char *new_data;
1339 size_t ret_len = len;
1340
1341 if (page[len - 1] == '\n' || page[len - 1] == '\0')
1342 --len;
1343 new_data = kmemdup(page, len, GFP_KERNEL);
1344 if (!new_data)
1345 return -ENOMEM;
1346
1347 if (desc->opts_mutex)
1348 mutex_lock(desc->opts_mutex);
1349 kfree(ext_prop->data);
1350 ext_prop->data = new_data;
1351 desc->ext_prop_len -= ext_prop->data_len;
1352 ext_prop->data_len = len;
1353 desc->ext_prop_len += ext_prop->data_len;
1354 if (ext_prop->type == USB_EXT_PROP_UNICODE ||
1355 ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
1356 ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
1357 desc->ext_prop_len -= ext_prop->data_len;
1358 ext_prop->data_len <<= 1;
1359 ext_prop->data_len += 2;
1360 desc->ext_prop_len += ext_prop->data_len;
1361 }
1362 if (desc->opts_mutex)
1363 mutex_unlock(desc->opts_mutex);
1364 return ret_len;
1365}
1366
1367CONFIGFS_ATTR(ext_prop_, type);
1368CONFIGFS_ATTR(ext_prop_, data);
1369
1370static struct configfs_attribute *ext_prop_attrs[] = {
1371 &ext_prop_attr_type,
1372 &ext_prop_attr_data,
1373 NULL,
1374};
1375
1376static void usb_os_desc_ext_prop_release(struct config_item *item)
1377{
1378 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1379
1380 kfree(ext_prop); /* frees a whole chunk */
1381}
1382
1383static struct configfs_item_operations ext_prop_ops = {
1384 .release = usb_os_desc_ext_prop_release,
1385};
1386
1387static struct config_item *ext_prop_make(
1388 struct config_group *group,
1389 const char *name)
1390{
1391 struct usb_os_desc_ext_prop *ext_prop;
1392 struct config_item_type *ext_prop_type;
1393 struct usb_os_desc *desc;
1394 char *vlabuf;
1395
1396 vla_group(data_chunk);
1397 vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
1398 vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
1399
1400 vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1401 if (!vlabuf)
1402 return ERR_PTR(-ENOMEM);
1403
1404 ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
1405 ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
1406
1407 desc = container_of(group, struct usb_os_desc, group);
1408 ext_prop_type->ct_item_ops = &ext_prop_ops;
1409 ext_prop_type->ct_attrs = ext_prop_attrs;
1410 ext_prop_type->ct_owner = desc->owner;
1411
1412 config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
1413
1414 ext_prop->name = kstrdup(name, GFP_KERNEL);
1415 if (!ext_prop->name) {
1416 kfree(vlabuf);
1417 return ERR_PTR(-ENOMEM);
1418 }
1419 desc->ext_prop_len += 14;
1420 ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
1421 if (desc->opts_mutex)
1422 mutex_lock(desc->opts_mutex);
1423 desc->ext_prop_len += ext_prop->name_len;
1424 list_add_tail(&ext_prop->entry, &desc->ext_prop);
1425 ++desc->ext_prop_count;
1426 if (desc->opts_mutex)
1427 mutex_unlock(desc->opts_mutex);
1428
1429 return &ext_prop->item;
1430}
1431
1432static void ext_prop_drop(struct config_group *group, struct config_item *item)
1433{
1434 struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
1435 struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
1436
1437 if (desc->opts_mutex)
1438 mutex_lock(desc->opts_mutex);
1439 list_del(&ext_prop->entry);
1440 --desc->ext_prop_count;
1441 kfree(ext_prop->name);
1442 desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
1443 if (desc->opts_mutex)
1444 mutex_unlock(desc->opts_mutex);
1445 config_item_put(item);
1446}
1447
1448static struct configfs_group_operations interf_grp_ops = {
1449 .make_item = &ext_prop_make,
1450 .drop_item = &ext_prop_drop,
1451};
1452
1453static ssize_t interf_grp_compatible_id_show(struct config_item *item,
1454 char *page)
1455{
1456 memcpy(page, to_usb_os_desc(item)->ext_compat_id, 8);
1457 return 8;
1458}
1459
1460static ssize_t interf_grp_compatible_id_store(struct config_item *item,
1461 const char *page, size_t len)
1462{
1463 struct usb_os_desc *desc = to_usb_os_desc(item);
1464 int l;
1465
1466 l = min_t(int, 8, len);
1467 if (page[l - 1] == '\n')
1468 --l;
1469 if (desc->opts_mutex)
1470 mutex_lock(desc->opts_mutex);
1471 memcpy(desc->ext_compat_id, page, l);
1472
1473 if (desc->opts_mutex)
1474 mutex_unlock(desc->opts_mutex);
1475
1476 return len;
1477}
1478
1479static ssize_t interf_grp_sub_compatible_id_show(struct config_item *item,
1480 char *page)
1481{
1482 memcpy(page, to_usb_os_desc(item)->ext_compat_id + 8, 8);
1483 return 8;
1484}
1485
1486static ssize_t interf_grp_sub_compatible_id_store(struct config_item *item,
1487 const char *page, size_t len)
1488{
1489 struct usb_os_desc *desc = to_usb_os_desc(item);
1490 int l;
1491
1492 l = min_t(int, 8, len);
1493 if (page[l - 1] == '\n')
1494 --l;
1495 if (desc->opts_mutex)
1496 mutex_lock(desc->opts_mutex);
1497 memcpy(desc->ext_compat_id + 8, page, l);
1498
1499 if (desc->opts_mutex)
1500 mutex_unlock(desc->opts_mutex);
1501
1502 return len;
1503}
1504
1505CONFIGFS_ATTR(interf_grp_, compatible_id);
1506CONFIGFS_ATTR(interf_grp_, sub_compatible_id);
1507
1508static struct configfs_attribute *interf_grp_attrs[] = {
1509 &interf_grp_attr_compatible_id,
1510 &interf_grp_attr_sub_compatible_id,
1511 NULL
1512};
1513
1514struct config_group *usb_os_desc_prepare_interf_dir(
1515 struct config_group *parent,
1516 int n_interf,
1517 struct usb_os_desc **desc,
1518 char **names,
1519 struct module *owner)
1520{
1521 struct config_group *os_desc_group;
1522 struct config_item_type *os_desc_type, *interface_type;
1523
1524 vla_group(data_chunk);
1525 vla_item(data_chunk, struct config_group, os_desc_group, 1);
1526 vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
1527 vla_item(data_chunk, struct config_item_type, interface_type, 1);
1528
1529 char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
1530 if (!vlabuf)
1531 return ERR_PTR(-ENOMEM);
1532
1533 os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
1534 os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
1535 interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
1536
1537 os_desc_type->ct_owner = owner;
1538 config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
1539 configfs_add_default_group(os_desc_group, parent);
1540
1541 interface_type->ct_group_ops = &interf_grp_ops;
1542 interface_type->ct_attrs = interf_grp_attrs;
1543 interface_type->ct_owner = owner;
1544
1545 while (n_interf--) {
1546 struct usb_os_desc *d;
1547
1548 d = desc[n_interf];
1549 d->owner = owner;
1550 config_group_init_type_name(&d->group, "", interface_type);
1551 config_item_set_name(&d->group.cg_item, "interface.%s",
1552 names[n_interf]);
1553 configfs_add_default_group(&d->group, os_desc_group);
1554 }
1555
1556 return os_desc_group;
1557}
1558EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
1559
1560static int configfs_do_nothing(struct usb_composite_dev *cdev)
1561{
1562 WARN_ON(1);
1563 return -EINVAL;
1564}
1565
1566int composite_dev_prepare(struct usb_composite_driver *composite,
1567 struct usb_composite_dev *dev);
1568
1569int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
1570 struct usb_ep *ep0);
1571
1572static void purge_configs_funcs(struct gadget_info *gi)
1573{
1574 struct usb_configuration *c;
1575
1576 list_for_each_entry(c, &gi->cdev.configs, list) {
1577 struct usb_function *f, *tmp;
1578 struct config_usb_cfg *cfg;
1579
1580 cfg = container_of(c, struct config_usb_cfg, c);
1581
1582 list_for_each_entry_safe_reverse(f, tmp, &c->functions, list) {
1583
1584 list_move(&f->list, &cfg->func_list);
1585 if (f->unbind) {
1586 dev_dbg(&gi->cdev.gadget->dev,
1587 "unbind function '%s'/%p\n",
1588 f->name, f);
1589 f->unbind(c, f);
1590 }
1591 }
1592 c->next_interface_id = 0;
1593 memset(c->interface, 0, sizeof(c->interface));
1594 c->superspeed_plus = 0;
1595 c->superspeed = 0;
1596 c->highspeed = 0;
1597 c->fullspeed = 0;
1598 }
1599}
1600
1601static struct usb_string *
1602configfs_attach_gadget_strings(struct gadget_info *gi)
1603{
1604 struct usb_gadget_strings **gadget_strings;
1605 struct gadget_language *language;
1606 struct gadget_string *string;
1607 unsigned int nlangs = 0;
1608 struct list_head *iter;
1609 struct usb_string *us;
1610 unsigned int i = 0;
1611 int nstrings = -1;
1612 unsigned int j;
1613
1614 list_for_each(iter, &gi->string_list)
1615 nlangs++;
1616
1617 /* Bail out early if no languages are configured */
1618 if (!nlangs)
1619 return NULL;
1620
1621 gadget_strings = kcalloc(nlangs + 1, /* including NULL terminator */
1622 sizeof(struct usb_gadget_strings *), GFP_KERNEL);
1623 if (!gadget_strings)
1624 return ERR_PTR(-ENOMEM);
1625
1626 list_for_each_entry(language, &gi->string_list, list) {
1627 struct usb_string *stringtab;
1628
1629 if (nstrings == -1) {
1630 nstrings = language->nstrings;
1631 } else if (nstrings != language->nstrings) {
1632 pr_err("languages must contain the same number of strings\n");
1633 us = ERR_PTR(-EINVAL);
1634 goto cleanup;
1635 }
1636
1637 stringtab = kcalloc(language->nstrings + 1, sizeof(struct usb_string),
1638 GFP_KERNEL);
1639 if (!stringtab) {
1640 us = ERR_PTR(-ENOMEM);
1641 goto cleanup;
1642 }
1643
1644 stringtab[USB_GADGET_MANUFACTURER_IDX].id = USB_GADGET_MANUFACTURER_IDX;
1645 stringtab[USB_GADGET_MANUFACTURER_IDX].s = language->manufacturer;
1646 stringtab[USB_GADGET_PRODUCT_IDX].id = USB_GADGET_PRODUCT_IDX;
1647 stringtab[USB_GADGET_PRODUCT_IDX].s = language->product;
1648 stringtab[USB_GADGET_SERIAL_IDX].id = USB_GADGET_SERIAL_IDX;
1649 stringtab[USB_GADGET_SERIAL_IDX].s = language->serialnumber;
1650
1651 j = USB_GADGET_FIRST_AVAIL_IDX;
1652 list_for_each_entry(string, &language->gadget_strings, list) {
1653 memcpy(&stringtab[j], &string->usb_string, sizeof(struct usb_string));
1654 j++;
1655 }
1656
1657 language->stringtab_dev.strings = stringtab;
1658 gadget_strings[i] = &language->stringtab_dev;
1659 i++;
1660 }
1661
1662 us = usb_gstrings_attach(&gi->cdev, gadget_strings, nstrings);
1663
1664cleanup:
1665 list_for_each_entry(language, &gi->string_list, list) {
1666 kfree(language->stringtab_dev.strings);
1667 language->stringtab_dev.strings = NULL;
1668 }
1669
1670 kfree(gadget_strings);
1671
1672 return us;
1673}
1674
1675static int configfs_composite_bind(struct usb_gadget *gadget,
1676 struct usb_gadget_driver *gdriver)
1677{
1678 struct usb_composite_driver *composite = to_cdriver(gdriver);
1679 struct gadget_info *gi = container_of(composite,
1680 struct gadget_info, composite);
1681 struct usb_composite_dev *cdev = &gi->cdev;
1682 struct usb_configuration *c;
1683 struct usb_string *s;
1684 unsigned i;
1685 int ret;
1686
1687 /* the gi->lock is hold by the caller */
1688 gi->unbind = 0;
1689 cdev->gadget = gadget;
1690 set_gadget_data(gadget, cdev);
1691 ret = composite_dev_prepare(composite, cdev);
1692 if (ret)
1693 return ret;
1694 /* and now the gadget bind */
1695 ret = -EINVAL;
1696
1697 if (list_empty(&gi->cdev.configs)) {
1698 pr_err("Need at least one configuration in %s.\n",
1699 gi->composite.name);
1700 goto err_comp_cleanup;
1701 }
1702
1703
1704 list_for_each_entry(c, &gi->cdev.configs, list) {
1705 struct config_usb_cfg *cfg;
1706
1707 cfg = container_of(c, struct config_usb_cfg, c);
1708 if (list_empty(&cfg->func_list)) {
1709 pr_err("Config %s/%d of %s needs at least one function.\n",
1710 c->label, c->bConfigurationValue,
1711 gi->composite.name);
1712 goto err_comp_cleanup;
1713 }
1714 }
1715
1716 /* init all strings */
1717 if (!list_empty(&gi->string_list)) {
1718 s = configfs_attach_gadget_strings(gi);
1719 if (IS_ERR(s)) {
1720 ret = PTR_ERR(s);
1721 goto err_comp_cleanup;
1722 }
1723
1724 gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
1725 gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
1726 gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
1727
1728 gi->cdev.usb_strings = s;
1729 }
1730
1731 if (gi->use_webusb) {
1732 cdev->use_webusb = true;
1733 cdev->bcd_webusb_version = gi->bcd_webusb_version;
1734 cdev->b_webusb_vendor_code = gi->b_webusb_vendor_code;
1735 memcpy(cdev->landing_page, gi->landing_page, WEBUSB_URL_RAW_MAX_LENGTH);
1736 }
1737
1738 if (gi->use_os_desc) {
1739 cdev->use_os_string = true;
1740 cdev->b_vendor_code = gi->b_vendor_code;
1741 memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
1742 }
1743
1744 if (gadget_is_otg(gadget) && !otg_desc[0]) {
1745 struct usb_descriptor_header *usb_desc;
1746
1747 usb_desc = usb_otg_descriptor_alloc(gadget);
1748 if (!usb_desc) {
1749 ret = -ENOMEM;
1750 goto err_comp_cleanup;
1751 }
1752 usb_otg_descriptor_init(gadget, usb_desc);
1753 otg_desc[0] = usb_desc;
1754 otg_desc[1] = NULL;
1755 }
1756
1757 /* Go through all configs, attach all functions */
1758 list_for_each_entry(c, &gi->cdev.configs, list) {
1759 struct config_usb_cfg *cfg;
1760 struct usb_function *f;
1761 struct usb_function *tmp;
1762 struct gadget_config_name *cn;
1763
1764 if (gadget_is_otg(gadget))
1765 c->descriptors = otg_desc;
1766
1767 /* Properly configure the bmAttributes wakeup bit */
1768 check_remote_wakeup_config(gadget, c);
1769
1770 cfg = container_of(c, struct config_usb_cfg, c);
1771 if (!list_empty(&cfg->string_list)) {
1772 i = 0;
1773 list_for_each_entry(cn, &cfg->string_list, list) {
1774 cfg->gstrings[i] = &cn->stringtab_dev;
1775 cn->stringtab_dev.strings = &cn->strings;
1776 cn->strings.s = cn->configuration;
1777 i++;
1778 }
1779 cfg->gstrings[i] = NULL;
1780 s = usb_gstrings_attach(&gi->cdev, cfg->gstrings, 1);
1781 if (IS_ERR(s)) {
1782 ret = PTR_ERR(s);
1783 goto err_comp_cleanup;
1784 }
1785 c->iConfiguration = s[0].id;
1786 }
1787
1788 list_for_each_entry_safe(f, tmp, &cfg->func_list, list) {
1789 list_del(&f->list);
1790 ret = usb_add_function(c, f);
1791 if (ret) {
1792 list_add(&f->list, &cfg->func_list);
1793 goto err_purge_funcs;
1794 }
1795 }
1796 ret = usb_gadget_check_config(cdev->gadget);
1797 if (ret)
1798 goto err_purge_funcs;
1799
1800 usb_ep_autoconfig_reset(cdev->gadget);
1801 }
1802 if (cdev->use_os_string) {
1803 ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
1804 if (ret)
1805 goto err_purge_funcs;
1806 }
1807
1808 usb_ep_autoconfig_reset(cdev->gadget);
1809 return 0;
1810
1811err_purge_funcs:
1812 purge_configs_funcs(gi);
1813err_comp_cleanup:
1814 composite_dev_cleanup(cdev);
1815 return ret;
1816}
1817
1818static void configfs_composite_unbind(struct usb_gadget *gadget)
1819{
1820 struct usb_composite_dev *cdev;
1821 struct gadget_info *gi;
1822 unsigned long flags;
1823
1824 /* the gi->lock is hold by the caller */
1825
1826 cdev = get_gadget_data(gadget);
1827 gi = container_of(cdev, struct gadget_info, cdev);
1828 spin_lock_irqsave(&gi->spinlock, flags);
1829 gi->unbind = 1;
1830 spin_unlock_irqrestore(&gi->spinlock, flags);
1831
1832 kfree(otg_desc[0]);
1833 otg_desc[0] = NULL;
1834 purge_configs_funcs(gi);
1835 composite_dev_cleanup(cdev);
1836 usb_ep_autoconfig_reset(cdev->gadget);
1837 spin_lock_irqsave(&gi->spinlock, flags);
1838 cdev->gadget = NULL;
1839 cdev->deactivations = 0;
1840 gadget->deactivated = false;
1841 set_gadget_data(gadget, NULL);
1842 spin_unlock_irqrestore(&gi->spinlock, flags);
1843}
1844
1845static int configfs_composite_setup(struct usb_gadget *gadget,
1846 const struct usb_ctrlrequest *ctrl)
1847{
1848 struct usb_composite_dev *cdev;
1849 struct gadget_info *gi;
1850 unsigned long flags;
1851 int ret;
1852
1853 cdev = get_gadget_data(gadget);
1854 if (!cdev)
1855 return 0;
1856
1857 gi = container_of(cdev, struct gadget_info, cdev);
1858 spin_lock_irqsave(&gi->spinlock, flags);
1859 cdev = get_gadget_data(gadget);
1860 if (!cdev || gi->unbind) {
1861 spin_unlock_irqrestore(&gi->spinlock, flags);
1862 return 0;
1863 }
1864
1865 ret = composite_setup(gadget, ctrl);
1866 spin_unlock_irqrestore(&gi->spinlock, flags);
1867 return ret;
1868}
1869
1870static void configfs_composite_disconnect(struct usb_gadget *gadget)
1871{
1872 struct usb_composite_dev *cdev;
1873 struct gadget_info *gi;
1874 unsigned long flags;
1875
1876 cdev = get_gadget_data(gadget);
1877 if (!cdev)
1878 return;
1879
1880 gi = container_of(cdev, struct gadget_info, cdev);
1881 spin_lock_irqsave(&gi->spinlock, flags);
1882 cdev = get_gadget_data(gadget);
1883 if (!cdev || gi->unbind) {
1884 spin_unlock_irqrestore(&gi->spinlock, flags);
1885 return;
1886 }
1887
1888 composite_disconnect(gadget);
1889 spin_unlock_irqrestore(&gi->spinlock, flags);
1890}
1891
1892static void configfs_composite_reset(struct usb_gadget *gadget)
1893{
1894 struct usb_composite_dev *cdev;
1895 struct gadget_info *gi;
1896 unsigned long flags;
1897
1898 cdev = get_gadget_data(gadget);
1899 if (!cdev)
1900 return;
1901
1902 gi = container_of(cdev, struct gadget_info, cdev);
1903 spin_lock_irqsave(&gi->spinlock, flags);
1904 cdev = get_gadget_data(gadget);
1905 if (!cdev || gi->unbind) {
1906 spin_unlock_irqrestore(&gi->spinlock, flags);
1907 return;
1908 }
1909
1910 composite_reset(gadget);
1911 spin_unlock_irqrestore(&gi->spinlock, flags);
1912}
1913
1914static void configfs_composite_suspend(struct usb_gadget *gadget)
1915{
1916 struct usb_composite_dev *cdev;
1917 struct gadget_info *gi;
1918 unsigned long flags;
1919
1920 cdev = get_gadget_data(gadget);
1921 if (!cdev)
1922 return;
1923
1924 gi = container_of(cdev, struct gadget_info, cdev);
1925 spin_lock_irqsave(&gi->spinlock, flags);
1926 cdev = get_gadget_data(gadget);
1927 if (!cdev || gi->unbind) {
1928 spin_unlock_irqrestore(&gi->spinlock, flags);
1929 return;
1930 }
1931
1932 composite_suspend(gadget);
1933 spin_unlock_irqrestore(&gi->spinlock, flags);
1934}
1935
1936static void configfs_composite_resume(struct usb_gadget *gadget)
1937{
1938 struct usb_composite_dev *cdev;
1939 struct gadget_info *gi;
1940 unsigned long flags;
1941
1942 cdev = get_gadget_data(gadget);
1943 if (!cdev)
1944 return;
1945
1946 gi = container_of(cdev, struct gadget_info, cdev);
1947 spin_lock_irqsave(&gi->spinlock, flags);
1948 cdev = get_gadget_data(gadget);
1949 if (!cdev || gi->unbind) {
1950 spin_unlock_irqrestore(&gi->spinlock, flags);
1951 return;
1952 }
1953
1954 composite_resume(gadget);
1955 spin_unlock_irqrestore(&gi->spinlock, flags);
1956}
1957
1958static const struct usb_gadget_driver configfs_driver_template = {
1959 .bind = configfs_composite_bind,
1960 .unbind = configfs_composite_unbind,
1961
1962 .setup = configfs_composite_setup,
1963 .reset = configfs_composite_reset,
1964 .disconnect = configfs_composite_disconnect,
1965
1966 .suspend = configfs_composite_suspend,
1967 .resume = configfs_composite_resume,
1968
1969 .max_speed = USB_SPEED_SUPER_PLUS,
1970 .driver = {
1971 .owner = THIS_MODULE,
1972 },
1973 .match_existing_only = 1,
1974};
1975
1976static struct config_group *gadgets_make(
1977 struct config_group *group,
1978 const char *name)
1979{
1980 struct gadget_info *gi;
1981
1982 gi = kzalloc(sizeof(*gi), GFP_KERNEL);
1983 if (!gi)
1984 return ERR_PTR(-ENOMEM);
1985
1986 config_group_init_type_name(&gi->group, name, &gadget_root_type);
1987
1988 config_group_init_type_name(&gi->functions_group, "functions",
1989 &functions_type);
1990 configfs_add_default_group(&gi->functions_group, &gi->group);
1991
1992 config_group_init_type_name(&gi->configs_group, "configs",
1993 &config_desc_type);
1994 configfs_add_default_group(&gi->configs_group, &gi->group);
1995
1996 config_group_init_type_name(&gi->strings_group, "strings",
1997 &gadget_language_strings_type);
1998 configfs_add_default_group(&gi->strings_group, &gi->group);
1999
2000 config_group_init_type_name(&gi->os_desc_group, "os_desc",
2001 &os_desc_type);
2002 configfs_add_default_group(&gi->os_desc_group, &gi->group);
2003
2004 config_group_init_type_name(&gi->webusb_group, "webusb",
2005 &webusb_type);
2006 configfs_add_default_group(&gi->webusb_group, &gi->group);
2007
2008 gi->composite.bind = configfs_do_nothing;
2009 gi->composite.unbind = configfs_do_nothing;
2010 gi->composite.suspend = NULL;
2011 gi->composite.resume = NULL;
2012 gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
2013
2014 spin_lock_init(&gi->spinlock);
2015 mutex_init(&gi->lock);
2016 INIT_LIST_HEAD(&gi->string_list);
2017 INIT_LIST_HEAD(&gi->available_func);
2018
2019 composite_init_dev(&gi->cdev);
2020 gi->cdev.desc.bLength = USB_DT_DEVICE_SIZE;
2021 gi->cdev.desc.bDescriptorType = USB_DT_DEVICE;
2022 gi->cdev.desc.bcdDevice = cpu_to_le16(get_default_bcdDevice());
2023
2024 gi->composite.gadget_driver = configfs_driver_template;
2025
2026 gi->composite.gadget_driver.driver.name = kasprintf(GFP_KERNEL,
2027 "configfs-gadget.%s", name);
2028 if (!gi->composite.gadget_driver.driver.name)
2029 goto err;
2030
2031 gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);
2032 gi->composite.name = gi->composite.gadget_driver.function;
2033
2034 if (!gi->composite.gadget_driver.function)
2035 goto out_free_driver_name;
2036
2037 return &gi->group;
2038
2039out_free_driver_name:
2040 kfree(gi->composite.gadget_driver.driver.name);
2041err:
2042 kfree(gi);
2043 return ERR_PTR(-ENOMEM);
2044}
2045
2046static void gadgets_drop(struct config_group *group, struct config_item *item)
2047{
2048 config_item_put(item);
2049}
2050
2051static struct configfs_group_operations gadgets_ops = {
2052 .make_group = &gadgets_make,
2053 .drop_item = &gadgets_drop,
2054};
2055
2056static const struct config_item_type gadgets_type = {
2057 .ct_group_ops = &gadgets_ops,
2058 .ct_owner = THIS_MODULE,
2059};
2060
2061static struct configfs_subsystem gadget_subsys = {
2062 .su_group = {
2063 .cg_item = {
2064 .ci_namebuf = "usb_gadget",
2065 .ci_type = &gadgets_type,
2066 },
2067 },
2068 .su_mutex = __MUTEX_INITIALIZER(gadget_subsys.su_mutex),
2069};
2070
2071void unregister_gadget_item(struct config_item *item)
2072{
2073 struct gadget_info *gi = to_gadget_info(item);
2074
2075 mutex_lock(&gi->lock);
2076 unregister_gadget(gi);
2077 mutex_unlock(&gi->lock);
2078}
2079EXPORT_SYMBOL_GPL(unregister_gadget_item);
2080
2081static int __init gadget_cfs_init(void)
2082{
2083 int ret;
2084
2085 config_group_init(&gadget_subsys.su_group);
2086
2087 ret = configfs_register_subsystem(&gadget_subsys);
2088 return ret;
2089}
2090module_init(gadget_cfs_init);
2091
2092static void __exit gadget_cfs_exit(void)
2093{
2094 configfs_unregister_subsystem(&gadget_subsys);
2095}
2096module_exit(gadget_cfs_exit);